Improve blog post template

* Change explainations to quotes to avoid users preserving indentations
* Add hint to assign a due date

.gitlab/issue_templates/blog-post.md

@@ -5,30 +5,34 @@
 
 ## Authors
 
-    Name the involved authors here, maybe suggesting contributors.
-    If you know their GitLab aliases, use @username to keep them
-    involved.
+> Name the involved authors here, maybe suggesting contributors.
+> If you know their GitLab aliases, use @username to keep them
+> involved.
 
 ## Reviewers
 
-    Who do you want as reviewers of your Blog Post?
+> Who do you want as reviewers of your Blog Post?
 
 ## Topic and Content
 
-    Outline what you want to write about.
-    Specify the style of your post (e.g. report, user story, guide,
-    etc.).
+> Outline what you want to write about.
+> Specify the style of your post (e.g. report, user story, guide, etc.).
 
 ## Target Audience
 
-    Who is your blog post aimed at?
-    Should these people have previous knowledge or skills?
+> Who is your blog post aimed at?
+> Should these people have previous knowledge or skills?
 
 ## Publishing Date
 
-    When is your preferred date to publish your Blog Post?
+> When is your preferred date to publish your Blog Post?
+> 1. Add the date as text in this section
+> 2. Replace <date> in the quick action below with the date to generate an
+> automated entry in the GitLab Issue
+
+/due <date>
 
 ## Contribution
 
-    How does the content of your Blog Post contribute to the goals of
-    HIFIS Software-Services?
+> How does the content of your Blog Post contribute to the goals of
+> HIFIS Software-Services?